content/browser/media/media_interface_proxy.h

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_MEDIA_MEDIA_INTERFACE_PROXY_H_
#define CONTENT_BROWSER_MEDIA_MEDIA_INTERFACE_PROXY_H_

#include <memory>
#include <vector>

#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "media/mojo/features.h"
#include "media/mojo/interfaces/interface_factory.mojom.h"
#include "mojo/public/cpp/bindings/binding.h"
#include "services/service_manager/public/interfaces/interface_provider.mojom.h"

namespace media {
class MediaInterfaceProvider;
}

namespace content {

class RenderFrameHost;

// This implements the media::mojom::InterfaceFactory interface for
// RenderFrameHostImpl. Upon media::mojom::InterfaceFactory calls, it will
// figure out where to forward to the interface requests.
class MediaInterfaceProxy : public media::mojom::InterfaceFactory {
 public:
  // Constructs MediaInterfaceProxy and bind |this| to the |request|. When
  // connection error happens on the client interface, |error_handler| will be
  // called, which could destroy |this|.
  MediaInterfaceProxy(RenderFrameHost* render_frame_host,
                      media::mojom::InterfaceFactoryRequest request,
                      const base::Closure& error_handler);
  ~MediaInterfaceProxy() final;

  // media::mojom::InterfaceFactory implementation.
  void CreateAudioDecoder(media::mojom::AudioDecoderRequest request) final;
  void CreateVideoDecoder(media::mojom::VideoDecoderRequest request) final;
  void CreateRenderer(const std::string& audio_device_id,
                      media::mojom::RendererRequest request) final;
  void CreateCdm(const std::string& key_system,
                 media::mojom::ContentDecryptionModuleRequest request) final;

 private:
  // Get the |interface_factory_ptr_|.
  media::mojom::InterfaceFactory* GetMediaInterfaceFactory();

  // Get the |cdm_interface_factory_ptr_|.
  media::mojom::InterfaceFactory* GetCdmInterfaceFactory(
      const std::string& key_system);

  // Callback for connection error from |interface_factory_ptr_| or
  // |cdm_interface_factory_ptr_|.
  void OnMediaServiceConnectionError();
  void OnCdmServiceConnectionError();

  service_manager::mojom::InterfaceProviderPtr GetFrameServices();

  void ConnectToMediaService();
  void ConnectToCdmService(const std::string& key_system);

  // Safe to hold a raw pointer since |this| is owned by RenderFrameHostImpl.
  RenderFrameHost* render_frame_host_;

  // TODO(xhwang): Replace InterfaceProvider with a dedicated host interface.
  // See http://crbug.com/660573
  std::vector<std::unique_ptr<media::MediaInterfaceProvider>> media_registries_;

  mojo::Binding<media::mojom::InterfaceFactory> binding_;

  // InterfacePtr to the remote media::mojom::InterfaceFactory implementation
  // in the service named kMediaServiceName hosted in the process specified by
  // the "mojo_media_host" gn argument. Available options are browser, GPU and
  // utility processes.
  media::mojom::InterfaceFactoryPtr interface_factory_ptr_;

  // InterfacePtr to the remote media::mojom::InterfaceFactory implementation
  // in the service named kCdmServiceName hosted in the utility process.
  media::mojom::InterfaceFactoryPtr cdm_interface_factory_ptr_;

  base::ThreadChecker thread_checker_;

  DISALLOW_COPY_AND_ASSIGN(MediaInterfaceProxy);
};

}  // namespace content

#endif  // CONTENT_BROWSER_MEDIA_MEDIA_INTERFACE_PROXY_H_